CN111290205A

CN111290205A - Light emitting device, display apparatus, and control method of light emitting device

Info

Publication number: CN111290205A
Application number: CN201811496966.3A
Authority: CN
Inventors: 谢颂婷; 亓森林; 陈红运; 杨佳翼
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2018-12-07
Filing date: 2018-12-07
Publication date: 2020-06-16
Anticipated expiration: 2038-12-07
Also published as: WO2020114226A1; CN111290205B

Abstract

The invention provides a light emitting device, a display apparatus, and a control method of the light emitting device, the light emitting device including a light source for emitting a first light; and the light filtering component is used for filtering the first light to obtain second light, filtering blue light with the wavelength smaller than a preset wavelength or blue light with the wavelength within a preset wavelength range, and obtaining third light which is emitted by the light emitting device and comprises the second light and/or the first light of the unfiltered light, wherein the blue light weighted radiance of the third light is smaller than preset brightness. According to the invention, the light filtering component is used for filtering the blue light with the wavelength smaller than the preset wavelength or within the preset wavelength range, so that the value of the blue light weighted radiance of the third light emitted by the light-emitting device can be reduced, and the requirement of low blue light can be met.

Description

Light emitting device, display apparatus, and control method of light emitting device

Technical Field

The present invention relates to the field of optical technologies, and in particular, to a light emitting device, a display apparatus, and a method for controlling the light emitting device.

Background

This section is intended to provide a background or context to the specific embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.

At present, a laser projector usually adopts a technology of exciting fluorescent powder by blue light to generate light sources with other colors, the bandwidth of the blue light is narrow, and simultaneously, the energy is high, so that the blue light radiation harm can be caused.

The harm of blue light to the human eye is mainly a photochemical effect. Photochemical interaction refers to the chemical behavior and physical processes in which molecules in a cell absorb photons of a particular wavelength to produce an electronic transition to form a molecule in an excited state. The intensity of photochemical damage depends on the wavelength, and this property can be measured by the blue damage weighting function B (λ), i.e. taking the reciprocal of the amount (or energy) required for a certain wavelength to result in a certain reaction and finally normalizing it.

Referring to FIG. 1, a relative sensitivity curve corresponding to a blue light damage weighting function shows that light with a wavelength of 300-700 nm has a blue light damage effect, but the damage of 400-500nm blue light is the largest. The normalized values of the blue light hazard weighting functions of 400-500nm are given in table 1, the blue light hazard is maximum at 435nm and 440nm, the value of the blue light hazard weighting function is 1.00, and the blue light hazard on two sides of the peak value is gradually reduced.

Table 1400 shows values corresponding to the blue light hazard weighting function of 500nm

With the increasing attention paid to blue light hazards, countries have also begun to set up relevant safety standards for blue light hazards to reduce blue light hazards in products. In order to prevent the retina from being photochemically damaged due to long-term exposure to blue light, it is necessary to provide a display device capable of effectively reducing the damage of blue light in a specific wavelength band.

Disclosure of Invention

An aspect of the present invention provides a light emitting device including:

a light source for emitting a first light; and

the light filtering component is used for filtering blue light with the wavelength smaller than a preset wavelength or blue light with the wavelength within a preset wavelength range, and obtaining third light which is emitted by the light emitting device and comprises the second light and/or the first light of the unfiltered light, wherein the blue light weighted radiance of the third light is smaller than preset brightness.

Another aspect of the present invention provides a display apparatus comprising:

the light-emitting device is the light-emitting device; and

the light modulation device is used for modulating the first light emitted by the light source, and the filtering component is used for filtering the first light modulated by the light modulation device.

Another aspect of the present invention provides a method for controlling a light emitting device, the light emitting device including a light source and a filter assembly, the filter assembly including a cut-off filter and a driving unit connected to each other, the method including the steps of:

controlling the light source to emit first light;

detecting the current blue light weighted amplitude brightness of the third light emitted by the light-emitting device; and

calculating movement data of the cut-off filter according to the current blue light weighted radiance, preset brightness and the movement range of the cut-off filter, controlling the driving unit to drive the cut-off filter to move to a target position according to the movement data, filtering corresponding light beams in the first light by using the cut-off filter to filter blue light with the wavelength smaller than the preset wavelength or blue light with the wavelength within the preset wavelength range and obtain second light, wherein the third light emitted by the light-emitting device comprises the second light and/or the first light of unfiltered light, and the blue light weighted radiance of the third light is smaller than the preset brightness.

In the light emitting device, the display device and the control method of the light emitting device provided by the invention, the filtering component is used for filtering the blue light with the wavelength less than the preset wavelength or the blue light with the wavelength within the preset wavelength range, so that the value of the blue light weighted radiance of the third light emitted by the light emitting device and the display device is favorably reduced, and the requirement of low blue light is met.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments/modes of the present invention, the drawings needed to be used in the description of the embodiments/modes are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments/modes of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a graph of the relative sensitivity of the blue damage weighting function.

Fig. 2 is a schematic view of a light-emitting device provided by the present invention.

Fig. 3 is a power spectrum curve of an emergent ray of a conventional light-emitting device.

Fig. 4 is a schematic diagram of light interception of the filter assembly shown in fig. 2.

Fig. 5 is a schematic view of the filter assembly shown in fig. 2 showing light interception in a second embodiment.

Fig. 6A is a schematic structural diagram of the light-emitting device shown in fig. 2 in a third embodiment.

Fig. 6B is another schematic structural diagram of the light-emitting device shown in fig. 6A.

Fig. 7 is a schematic structural diagram of a filter assembly provided in a fourth embodiment of the light emitting device shown in fig. 2.

Fig. 8A is a schematic structural diagram of a cut-off filter provided in a fifth embodiment of the light-emitting device shown in fig. 2.

Fig. 8B is a schematic structural diagram of the cut-off filter shown in fig. 8A at a different position.

Fig. 9 is a schematic diagram of a display device provided by the present invention.

Description of the main elements

Light emitting device	10
		Light source	101
First light	L1
		Light filtering assembly	100、300、400
Drive unit	310、410
		Drive assembly	311
Rod body	313
		Track	411
Connecting part	413
		Cut-off filter	320、420、520
First region	521
		Second region	522
First position	M
		Second position	N
Display device
		1
Light modulation device			50

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Fig. 2 is a schematic view of a light emitting device 10 according to the present invention. The light emitting device 10 includes a light source 101 and a filter assembly 100. Wherein, the light source 101 is used for emitting a first light L1; the optical filtering component 100 is configured to filter the first light L1 to obtain a second light, and the optical filtering component 100 is configured to filter blue light with a wavelength smaller than a preset wavelength or blue light with a wavelength within a preset wavelength range; the third light emitted from the light emitting device 10 includes the second light and/or the first light without being filtered, and the blue light weighted radiance of the third light is smaller than the preset luminance.

Specifically, the light source 101 may be a laser light source, an LED light source, a fluorescent light source, or a laser fluorescent light source, and the kind of the light source is not limited in the present invention. The first light L1 can be monochromatic light, such as laser light of blue, red, green or ultraviolet light, or fluorescent light, and the first light L1 can also be composite light (mixture of several colors of light), such as yellow light. The first light may be illumination light having uniform brightness or image light having a bright-dark distribution.

The first light L1 is visible light, the wavelength range of the visible light is about 380-780nm, the wavelength range of the ultraviolet light is below 400nm, however, the light with the wavelength of 300-700 nm has the effect of blue light hazard, and thus, no matter the first light L1 emits monochromatic light or composite light, most of the light in the first light L1 has the blue light hazard, and the blue light generated by the blue light part with the wavelength of 400-500nm is most harmful.

The blue light harm generated by the first light L1 can be measured by blue light weighted radiance, and the blue light weighted radiance of the first light L1 is the spectral radiance L of the first light L1_λAnd when the blue light weighted amplitude brightness of the first light L1 is smaller than the preset brightness, the energy weighted by the blue light hazard weighting function meets the requirement of blue light hazard protection.

The blue light-weighted radiance value is recorded as L_BAnd the spectral radiance value is marked as L_λThe blue-ray hazard weighting function value is denoted as B (lambda), and the preset brightness value is denoted as z. In one embodiment, the preset brightness value z is 100W · m^-2·sr^-1That is, the blue-weighted amplitude brightness of the first light L1 is required to satisfy equation 1:

L_B＝∑L_λ·B(λ)·Δλ≤100W·m^-2·sr^-1(formula)1)。

The blue light weighted radiance is the weighted integral of the energy corresponding to each wavelength in the corresponding spectrum multiplied by the blue light hazard weighting function corresponding to each wavelength.

Fig. 3 is a graph of a power spectrum of light emitted from a conventional light-emitting device. The existing light-emitting device can be a laser fluorescent light source system of a laser projector, the laser fluorescent light source system utilizes blue laser to excite fluorescent powder to generate other primary color light, the first peak value on the left side in the figure corresponds to the energy of the blue laser, and the blue laser has a narrow bandwidth but high energy and cannot meet the formula 1. Therefore, the first light with blue light hazard is cut off, especially the light with strong blue light hazard is cut off, and the blue light weighted radiance L of the emergent light is favorably reduced_BTo meet the low blue light requirement.

Please refer to fig. 4, which is a schematic diagram illustrating light interception of the filter assembly 100 shown in fig. 2. The horizontal axis of the axes in the figure represents wavelength and the vertical axis represents efficiency, the maximum value of efficiency is 1, and the value B (λ) of the efficiency equal to 1 represents the blue-light-hazard weighting function of light is 1. The first optical wavelength range entering the optical filter assembly 100 is approximately 380-700nm, the wavelength of the light with the value B (λ) of the blue light hazard weighting function being 1 is around 430nm, the optical filter assembly 100 includes a cut-off filter to intercept the light with the wavelength less than the preset wavelength, and the first light with the wavelength greater than the preset wavelength can transmit the cut-off filter, so that the blue light hazard generated by the first light is weakened within a certain wavelength range, and part of energy in the blue light is retained, thereby facilitating the utilization of the rear-stage optical path. The preset wavelength value is recorded as lambda₁390nm < lambda, as shown in FIG. 4₁< 400nm, it is understood that the preset wavelength value can be selected according to equation 1. In this embodiment, the cut-off filter is preferably a long-wavelength pass filter to filter out light with a wavelength less than a predetermined wavelength. The cut-off filter may cut off 100% of light with a wavelength less than a predetermined wavelength, and in one embodiment, the cut-off filter is a partial cut-off filter, such as 90% or other ratio of light with a wavelength less than a second wavelength, where the second wavelength is denoted as λ₂Wherein λ is₁＜λ₂That is, 10% of the incident first light L1 or other light with a wavelength smaller than the second wavelength may also pass through the cut-off filter, so that the color of the image emitted from the light emitting device 10 is richer.

Referring to fig. 5, a light interception diagram of the filter assembly 100 shown in fig. 2 according to a second embodiment is shown. The horizontal axis of the axes in the figure represents wavelength and the vertical axis represents efficiency, the maximum value of efficiency is 1, and the value B (λ) of the efficiency equal to 1 represents the blue-light-hazard weighting function of light is 1. The blue light harm weighting function value B (λ) of the first light L1 is around 440nm, while the blue light harm weighting function value B (λ) of 415-460nm is above 0.8. The cut-off filter provided in this embodiment is a band-stop filter, and is configured to intercept light within a preset range p, and light outside the preset range p may pass through the cut-off filter. The preset range p may be expressed as (λ)₃-x，λ₃+ x) nm, where x is small, such as 2, in one embodiment, so as to avoid affecting the color accuracy of the light emitted from the light-emitting device 10 and the display device. It is understood that the cut-off filter in the present embodiment may cut off light within the preset range p by 100% or partially.

It should be noted that the embodiments of the present invention can be applied to other embodiments within the scope of the spirit or the basic features of the present invention, and for the sake of brevity and avoiding repetition, the details are not repeated herein.

Referring to fig. 6A and 6B, fig. 6A is a schematic structural diagram of the light emitting device 10 shown in fig. 2 in a third embodiment, and fig. 6B is another schematic structural diagram of the light emitting device 10 shown in fig. 6A. In the present embodiment, the light emitting device 10 includes a light source 101 and a filter assembly 300. The filter assembly 300 includes a movable cut-off filter 320, and the light emitting device 10 is configured to dynamically control the cut-off filter 320 to move according to the blue-weighted radiance of the third light emitted by the light emitting device 10 in the current state, so as to filter the corresponding light beam of the first light L1.

Specifically, the filter assembly 300 further includes a driving unit 310 for driving the cut filter 320 to move between the first position M and the second position N. The first position M is a position where the cut-off filter 320 does not filter the light emitted from the light source 101; the second position N is a position at which the cut-off filter 320 can filter the light emitted from the light source 101. As shown in fig. 6A, when the cut-off filter 320 is located at the first position M, the first light L1 is emitted from the light-emitting device 10 without being filtered by the filter assembly 300, the third light is the first light, and specifically, the cut-off filter 320 is located outside the optical path of the first light L1; when the cut-off filter 320 is located at the second position N, all the first light L1 is converted into the second light through the filtering of the cut-off filter 320, and the third light is the second light; as shown in fig. 6B, when the cut filter 320 is located between the first position M and the second position N, a part of the first light L1 is converted into the second light after being filtered by the cut filter 320, a part of the first light L1 exits from the light emitting device 10 without being filtered by the cut filter 320, and the third light includes the second light and the unfiltered first light.

Further, the light emitting device 10 further includes a brightness sensor (not shown) and a control device (not shown). The brightness sensor is arranged on a light emitting path of the display device and used for detecting the current blue light weighted radiance of the third light. In one embodiment, the luminance sensor is configured to detect a current blue light weighted radiance of light within a certain wavelength range, and the visible light wavelength is distributed at 300-.

The control device is configured to determine whether a current operating mode of the light emitting device 10 is a first operating mode, where the blue light emitted from the light emitting device 10 in the first operating mode is less harmful to the blue light emitted from other operating modes, and the first operating mode may also be referred to as a low blue light mode. The light emitting device 10 may further have a plurality of operation modes other than the first operation mode, such as a highlight mode, a normal mode, and the like, and the light emitting device 10 may be adjusted between the plurality of operation modes according to a preset rule or may change the operation modes according to a user operation. If the light emitting device 10 is in the first operating mode, the movement data of the cut-off filter 320 is calculated according to the detected current blue-light weighted radiance, the preset brightness, and the relative position relationship between the first position M and the second position N (the movement range of the cut-off filter 320 in the filter assembly 300), and the driving unit 310 is controlled to drive the cut-off filter 320 to move to the target position, so as to filter the corresponding light beam in the first light L1. In one embodiment, in a case where the blue light component is less in a part of the image frames in the display image sequence, and the first light is not filtered by the filter assembly, and the blue light weighted radiance of the third light is already less than the preset radiance, the display device does not filter the first light by using the filter assembly.

In this embodiment, the driving unit 310 further includes a driving element 311 and a rod 313, and the rod 313 is connected between the driving element 311 and the cut-off filter 320. The driving component 313 is used for driving the rod body 313 to rotate to a target position around the driving component 311 by a corresponding angle according to the moving data. In one embodiment, driving assembly 311 includes a gear for driving rod 313 to rotate around the gear within an angle of 0- θ, and in other embodiments, driving assembly 311 may also employ a worm gear or other mechanical transmission.

When the cut-off filter 320 moves from the first position M to the target position, the angle value rotated by the rod 313 is defined as θ₀The control device weights the radiance value L according to the current blue light detected in real time_B0Calculating an angle value θ corresponding to the target position of the cut-off filter 320 according to the preset brightness value z and the relative position relationship between the first position M and the second position N₀. In one embodiment, the amount of angle θ the lever 313 rotates through₀Satisfies formula 2:

θ₀＝{(L_B0-z)/z }. theta (formula 2).

For example, the detected current blue light-weighted radiance value L_B0＝150W·m^-2·sr^-1If the rotation angle exceeds 50% of the preset brightness value, the rotation angle of the stick 313 corresponding to the target position is θ/2.

Fig. 7 is a schematic structural diagram of a filter assembly 400 provided in a fourth embodiment of the light emitting device 10 shown in fig. 2. The filter assembly 400 is mainly different from the filter assembly 300 in that the driving unit 410 of the filter assembly 400 is used for driving the cut-off filter 420 to move along a straight line to a target position according to the movement data. The driving unit 410 includes a rail 411 and a connecting portion 413, wherein the rail 411 and the connecting portion 413 are slidably connected, one end of the connecting portion 413 is used for bearing the cut-off filter 420, the other end of the connecting portion 413 is used for sliding between a first position M and a second position N of the rail 411, and a distance between the first position M and the second position N is L. The target position is at a distance L from the first position M₀Distance L₀Satisfies formula 3:

L₀＝{(L_B0-z)/z }. L (formula 3).

It is understood that the driving unit 410 may also move the cut-off filter 420 using a belt transmission or the like.

Referring to fig. 8A and 8B, fig. 8A is a schematic structural diagram of a cut-off filter 520 provided in a fifth embodiment of the light emitting device 10 shown in fig. 2, and fig. 8B is a schematic structural diagram of the cut-off filter 520 shown in fig. 8A at different positions.

As shown in fig. 8A, the surface of the cut-off filter 520 includes a first region 521 and a second region 522 that are adjacently disposed, where the first region 521 is used for transmitting light, and the second region 522 is used for filtering out blue light with a wavelength less than a predetermined wavelength or blue light with a wavelength within a predetermined wavelength range to obtain second light. The first region 521 and the second region 522 may be spaced apart. The shape of the cut-off filter 520 is not limited to a circle, but may be a square, an ellipse, or other regular or irregular shape. In this embodiment, the first region 521 and the second region 522 are respectively disposed at one end of the surface of the cut filter 520, in other embodiments, the first region 521 and the second region 522 may be respectively in any one of a circular shape, an annular shape, a square shape, and a stripe shape, and the first region 521 may be disposed at the periphery of the second region 522.

As shown in fig. 8B, when the cut-off filter 520 is located at the first position M, the second region 522 is located outside the optical path of the first light, and the first light exits from the light-emitting device 10 without passing through the cut-off filter 520 or after passing through the first region 521 of the cut-off filter 520, so that the third light is the first light; when the cut-off filter 520 is located at the second position N, all the first light passes through the second region 522, is converted into second light, and then is emitted from the light-emitting device 10, where the third light is the second light; when the cut filter 520 is located between the first position M and the second position N, a portion of the first light passes through the first region 521, a portion of the first light passes through the second region 522 to be converted into second light, and the third light includes the second light and the unfiltered first light.

In the present embodiment, the respective beams of the first light are filtered by rotating the cut-off filter 520 so that the respective portions of the second region 522 are positioned on the optical path of the first light. Specifically, the central angle occupied by the portion of the second area 522 illuminated by the first light satisfies formula 4:

α＝{(L_B0-z)/z }. 180 ° (formula 4).

The invention also provides a control method of the light-emitting device, the light-emitting device comprises a light source and a filter assembly, the filter assembly comprises a cut-off filter and a driving unit which are connected with each other, and the control method of the light-emitting device comprises the following steps:

s1: controlling a light source to emit first light;

s2: detecting the current blue light weighted amplitude brightness of the third light emitted by the light-emitting device;

s3: calculating movement data of the cut-off filter according to the current blue light weighted radiance, the preset brightness and the movement range of the cut-off filter, controlling the driving unit to drive the cut-off filter to move to the target position according to the movement data, filtering corresponding light beams in the first light by using the cut-off filter to obtain second light, enabling third light emitted by the light emitting device to comprise the second light and/or the first light of the unfiltered light, and enabling the blue light weighted radiance of the third light to be smaller than the preset brightness.

In one embodiment, the method further includes a step of determining whether the current light-emitting device is in the first operation mode in step S3; and if the current light-emitting device is in the first working mode, calculating to obtain the movement data of the cut-off filter according to the current blue light weighted radiance, the preset brightness and the movement range of the cut-off filter.

The light emitting device 10 provided by the present invention may be a light source in an illumination apparatus, a background light source in a display apparatus, or a light source system in a display apparatus. The present invention further provides a display device using the above light emitting apparatus, where the display device may be a series of laser projectors such as an education projector, an engineering projector, and a laser television, and the display device of this embodiment is described by taking a projection device as an example.

Fig. 9 is a schematic diagram of a display device 1 according to the present invention. The display device 1 includes a light emitting device 10 and a light modulation device 50, the light emitting device 10 includes a light source 101 and a filter assembly 100, where the light source 101 and the filter assembly 100 are both adapted to the technical solutions provided in the above embodiments, the light modulation device 50 is configured to modulate first light L1 emitted from the light source 101, and the filter assembly 100 is configured to filter the first light L1 modulated by the light modulation device 50, which is beneficial to reducing blue-light weighted radiance L of third light emitted from the display device 1_BTo meet the low blue light requirement.

It can be understood that the specific technical solutions in the above embodiments can be applied to a control method of a display device, and are not described herein again.

According to the display device and the control method of the display device, the filtering component is used for filtering the blue light with the wavelength smaller than the preset wavelength or within the preset wavelength range, so that the value of the blue light weighted radiance of the third light emitted by the display device can be reduced, and the requirement of low blue light can be met.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several of the means recited in the apparatus claims may also be embodied by one and the same means or system in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A light-emitting device, comprising:

a light source for emitting a first light; and

2. The lighting device as claimed in claim 1, wherein the filter assembly includes a cut-off filter, and the cut-off filter is used for filtering out blue light with a wavelength less than the predetermined wavelength or blue light with a wavelength within the predetermined wavelength range.

3. The light-emitting device according to claim 2, wherein the cut filter is a long-wavelength pass filter or a band-stop filter.

4. The light-emitting device according to claim 2, wherein the cut filter is always located on an outgoing path of the first light.

5. The light-emitting apparatus according to claim 2,

the filter assembly further comprises a driving unit for driving the cut-off filter to move between a first position and a second position;

the light emitting device further includes:

a brightness sensor for detecting a current blue light-weighted radiance of the third light;

and the control device is used for calculating movement data of the cut-off filter according to the current blue light weighted radiance, preset brightness and the relative position relation between the first position and the second position, and controlling the driving unit to drive the cut-off filter to move to a target position according to the movement data.

6. The light-emitting device according to claim 5, wherein when the cut filter is located at the first position, the first light exits the light-emitting device without being filtered by the cut filter, and the third light is the first light; when the cut-off filter is located at the second position, all the first light is converted into the second light after being filtered by the cut-off filter, and the third light is the second light; when the cut-off filter is located between the first position and the second position, part of the first light is converted into the second light after being filtered by the cut-off filter, and the third light comprises the second light and the first light which is not filtered.

7. The light-emitting device according to claim 5, wherein the driving unit further comprises a driving element and a rod, the rod is connected between the driving element and the cut-off filter, and the driving element is configured to drive the rod to rotate around the driving element by a corresponding angle to the target position according to the movement data.

8. The light-emitting device according to claim 5, wherein the driving unit is configured to move the cut-off filter to the target position along a straight line according to the movement data.

9. The light-emitting device according to claim 5, wherein the cut-off filter surface includes a first region and a second region, the first region is used for transmitting light, and the second region is used for filtering out blue light with a wavelength less than the predetermined wavelength or blue light with a wavelength within the predetermined wavelength range to obtain the second light.

10. The light-emitting device according to claim 9, wherein when the cut filter is in the first position, the second region is located outside an optical path of the first light, and the third light is the first light; when the cut-off filter is located at the second position, all the first light passes through the second area and is converted into the second light, and the third light is the second light; when the cut-off filter is located between the first position and the second position, a part of the first light passes through the first region, a part of the first light passes through the second region and is converted into the second light, and the third light comprises the second light and the unfiltered first light.

11. A display device, comprising:

a light-emitting device according to any one of claims 1 to 10; and

12. A method of controlling a light emitting device, the light emitting device including a light source and a filter assembly, the filter assembly including a cut filter and a driving unit connected to each other, the method comprising the steps of:

controlling the light source to emit first light;